Eliminate magnetic cogging torque, minimize mechanical time constants, and achieve efficiency exceeding 88% in ultra-compact envelopes designed for surgical robotics, portable medical devices, and precision optics.
Ironless self-supporting skew winding
Prototype functional samples in 3-5 weeks
ISO 9001 certified OEM supply chain
40 years of precision motion innovation
Conventional brushed DC motors utilize an iron core armature with copper wire wound into laminated steel slots. While robust, this classical design suffers from heavy rotor inertia, iron eddy current losses, and magnetic preferred positions known as cogging torque. Telco’s Coreless DC Motors solve these physical bottlenecks completely through a self-supporting, ironless skew-wound coil array operating within a high-density neodymium magnetic field.
In standard slotted DC motors, the rotor’s iron teeth continuously align with the stator magnets as they rotate, creating periodic detent torque spikes (cogging). In surgical handpieces, drug delivery systems, or optical gimbal controls, this manifests as tactile vibration and velocity ripple. Coreless DC motors eliminate iron from the rotor structure entirely. With no magnetic attraction between rotor copper and permanent magnet poles, rotation remains liquid-smooth even at speeds below 1 RPM.
The mechanical time constant (τm) represents the time required for a motor to reach 63.2% of its no-load speed from standstill under step voltage input. Because the rotor contains no heavy iron lamination core, its moment of inertia (J) is fractions of a conventional motor. Telco coreless motors exhibit mechanical time constants as low as 1.8 to 4.5 milliseconds, enabling instantaneous acceleration curves, minimal overshoot, and superior closed-loop dynamic responsiveness.
Choosing the correct commutation system is critical to optimizing operational service life and electrical efficiency. Telco engineers configure coreless motors with two primary commutation platforms based on your application's continuous power and duty cycle requirements:
From ultra-compact 8mm micro-drives to high-torque 35mm industrial platforms, Telco configures coreless motors engineered precisely to your mounting envelope, electrical bus, and continuous duty requirements.
Designed for ultra-miniature equipment where weight and volume are the controlling constraints.
Primary Applications: Micro infusion pumps, ophthalmic instruments, optical zoom control, beam steering.
Inquire NowThe standard workhorse for high-precision surgical robotics, power tools, and automated laboratory handlers.
Primary Applications: Surgical handpieces, robotic end-effectors, syringe drivers, dialysis equipment.
Inquire NowIntegrated coreless motor and precision planetary micro-gearhead assemblies for high payload demands.
Primary Applications: Exoskeleton joints, motorized prosthetics, aerospace actuators, valve control.
Inquire Now| Model Platform | Frame Dia. (mm) | Nominal Voltage (V) | No-Load Speed (RPM) | Stall Torque (mN·m) | Mech. Time Const. (ms) | Peak Efficiency (%) | Commutation Type |
|---|---|---|---|---|---|---|---|
| T-CLM-0816 | 8.0 | 3.0 – 6.0 | 14,500 | 1.1 | 3.8 | 79% | Precious Metal |
| T-CLM-1020 | 10.0 | 3.7 – 12.0 | 16,200 | 2.4 | 3.2 | 82% | Precious Metal |
| T-CLM-1628 | 16.0 | 6.0 – 24.0 | 11,800 | 12.5 | 2.5 | 86% | Precious Metal / Graphite |
| T-CLM-2232 | 22.0 | 12.0 – 36.0 | 9,400 | 38.0 | 2.1 | 88% | Graphite Commutation |
| T-CLM-2845 | 28.0 | 18.0 – 48.0 | 8,100 | 110.0 | 1.9 | 89% | Graphite Commutation |
| T-CLM-3560 | 35.0 | 24.0 – 48.0 | 6,500 | 245.0 | 1.8 | 90% | Graphite Commutation |
* Note: All platform parameters are reference base specifications. Telco customizes winding constants (Kv, Kt), shaft length/flats, lead wire harnesses, and thermal insulation ratings to match your design requirement sheet.
As global OEM procurement teams navigate evolving supply chain complexities, AI-driven automation, and stringent medical regulatory updates, the sourcing paradigm for micro-motion technology is undergoing key structural shifts.
While brushed coreless motors excel in simplicity and ultra-low starting voltage, next-generation medical and aerospace platforms are increasingly transitioning toward slotless BLDC (brushless coreless) configurations. By combining an ironless stationary winding structure with an internal rotating permanent magnet rotor, equipment designers eliminate brush wear completely while retaining zero cogging performance. Procurement teams must partner with motor vendors who support both brushed coreless and slotless BLDC platforms under unified engineering controls.
Sourcing individual components—motor, planetary gearbox, encoder, brake, and electronic drive—creates procurement friction, complex stack-up tolerances, and vendor finger-pointing during quality failures. Sourcing trends show over 68% of tier-1 OEMs moving toward single-source integrated motion sub-assemblies. Telco delivers complete, pre-tested motion modules certified with drawing-controlled mechanical interfaces and plugged connector harnesses ready for direct line installation.
Coreless motor power density relies heavily on high-grade rare-earth magnets (such as N48H, N52H, or SH-grade NdFeB operating up to 180°C). Market volatility in raw rare-earth materials requires OEM procurement directors to partner with vendors possessing diversified global raw-material sourcing contracts, robust inventory buffering programs, and long-term cost-index modeling.
Medical device manufacturers face escalating regulatory scrutiny under the EU Medical Device Regulation (MDR) and FDA 21 CFR Part 820. Motor component sourcing now mandates full material traceability, lot-level magnet certificate verification, RoHS3/REACH SVHC declarations, and formalized Product Change Notification (PCN) locks to prevent unannounced sub-tier design modifications.
Founded in 1985, Telco Intercontinental Corp. brings nearly 40 years of application engineering, design-for-manufacturability (DFM), and global supply management to demanding OEM motion control projects. We bridge the gap between high-level US application engineering support and cost-optimized, ISO-driven manufacturing facilities.
A rigorous 5-stage engineering workflow designed to de-risk development, shorten time-to-market, and validate quality before volume production release.
Analysis of your load duty cycle, voltage bus, envelope limits, thermal ambient, and target annual volume.
Electromagnetic and coil winding calculation to optimize Kv, torque constant Kt, and thermal rise.
3 to 5 week rapid delivery of functional prototype samples complete with dynamometer test reports.
Life cycle, acoustic noise, thermal dissipation, and FAI approval in your actual application equipment.
ISO-controlled mass production with buffer stock management and drawing-controlled change governance.
Detailed answers addressing critical performance, thermal dynamics, customization options, and sourcing strategies.
Coreless DC motors utilize a self-supporting, ironless skew-wound rotor coil instead of a heavy slotted iron core. This eliminates magnetic cogging torque completely, producing liquid-smooth operation at low speeds, extremely low rotor moment of inertia, rapid mechanical response times (often under 3 ms), minimal electromagnetic interference (EMI), and energy efficiency exceeding 85%, which significantly extends battery run-time in portable devices.
Precious Metal Commutation (PMC) delivers exceptionally low contact resistance, minimal electrical noise, and ultra-low starting voltages, making it ideal for low-current, battery-operated continuous duty applications like medical infusion pumps, portable diagnostics, micro-valves, and optics. Graphite (Carbon) Commutation is preferred for heavy-duty applications requiring high peak current pulses, frequent start-stop direction reversal, higher power output, and severe mechanical braking, such as surgical power tools, exoskeletons, and industrial robotics.
Because coreless rotors lack a heavy iron stack to absorb peak thermal energy, continuous torque output is bounded by the maximum allowable coil temperature (typically 125°C to 155°C). Telco employs high-grade Class F/H self-bonding magnet wire, precision NdFeB inner magnetic topologies, high-efficiency heat sink aluminum housings, and specialized encapsulation resins. Our application engineering team calculates precise thermal resistance parameters (Rth1 rotor-to-housing and Rth2 housing-to-ambient) to ensure your duty cycle remains within safe operating thermal margins.
Yes. Telco specializes in integrated motion sub-assemblies. We offer precision metal and hybrid planetary gearheads matching coreless frame sizes (from 8mm to 35mm diameter) with gear ratios ranging from 4:1 up to 1024:1+. Additionally, we integrate high-resolution magnetic or optical encoders (up to 4096 CPR), custom shaft geometries (D-cuts, keyways, pinions), specialized lead wire harnesses, and custom mounting flanges.
To evaluate your design requirement, share your operating supply voltage (VDC), target working speed (RPM), continuous torque (mN·m), peak load duty cycle, maximum allowable frame diameter/length, encoder resolution requirement, gear ratio if applicable, target operating environment (ambient temp, IP sealing), and estimated annual production volume. Telco application engineers usually return a technical concept sheet and estimated cost model within 2 to 3 business days.
Modified standard coreless motor samples (custom winding turns, lead wire connectors, shaft modifications) reach functional testing in approximately 3 to 5 weeks. Ground-up custom configurations with specialized housing tooling take 8 to 12 weeks. Telco operates under strict ISO 9001 quality frameworks, providing drawing-controlled specifications, First Article Inspection (FAI) reports, RoHS/REACH material declarations, and formal Product Change Notification (PCN) agreements.
Brushed coreless DC motors require simple 2-wire DC voltage control or straightforward PWM drive circuits, resulting in lower total system electronics cost and rapid deployment. Brushless slotless motors require 3-phase inverter electronics and position sensors (or sensorless algorithms), raising driver complexity and cost, but they offer virtually unlimited bearing-limited service life. Telco supplies both technologies so your design team can select the optimal balance between system cost, life hours, and electronics footprint.
Send your continuous torque, speed, envelope restrictions, and volume targets. Speak directly with a Telco motion application engineer today.
Inquire NowNot sure whether Precious Metal or Graphite Commutation fits your operational duty cycle? Review your application specs with our US engineering team.
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